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From: Sowjanya Komatineni <skomatineni@nvidia.com>
To: <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
	<talho@nvidia.com>, <skomatineni@nvidia.com>,
	<broonie@kernel.org>, <robh+dt@kernel.org>,
	<mark.rutland@arm.com>, <kyarlagadda@nvidia.com>
Cc: <ldewangan@nvidia.com>, <linux-tegra@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-spi@vger.kernel.org>,
	<devicetree@vger.kernel.org>
Subject: [PATCH V1 12/26] spi: tegra114: add SPI_LSB_FIRST support
Date: Tue, 26 Mar 2019 22:56:33 -0700	[thread overview]
Message-ID: <1553666207-11414-12-git-send-email-skomatineni@nvidia.com> (raw)
In-Reply-To: <1553666207-11414-1-git-send-email-skomatineni@nvidia.com>

Tegra SPI controller supports lsb first mode. Default is MSB bit first
and on selection of SPI_LSB_FIRST through SPI mode transmission happens
with LSB bit first.

This patch adds SPI_LSB_FIRST flag to mode_bits and also configures it
on request.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/spi/spi-tegra114.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index 0e228f1e910e..d39f7b05b824 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -750,6 +750,11 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
 		else if (req_mode == SPI_MODE_3)
 			command1 |= SPI_CONTROL_MODE_3;
 
+		if (spi->mode & SPI_LSB_FIRST)
+			command1 |= SPI_LSBIT_FE;
+		else
+			command1 &= ~SPI_LSBIT_FE;
+
 		if (tspi->cs_control) {
 			if (tspi->cs_control != spi)
 				tegra_spi_writel(tspi, command1, SPI_COMMAND1);
@@ -1137,7 +1142,7 @@ static int tegra_spi_probe(struct platform_device *pdev)
 		master->max_speed_hz = 25000000; /* 25MHz */
 
 	/* the spi->mode bits understood by this driver: */
-	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
 	master->setup = tegra_spi_setup;
 	master->transfer_one_message = tegra_spi_transfer_one_message;
 	master->num_chipselect = MAX_CHIP_SELECT;
-- 
2.7.4


  parent reply	other threads:[~2019-03-27  5:58 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-27  5:56 [PATCH V1 01/26] spi: tegra114: fix PIO transfer Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 02/26] spi: tegra114: clear packed bit for unpacked mode Sowjanya Komatineni
2019-04-01  8:54   ` Applied "spi: tegra114: clear packed bit for unpacked mode" to the spi tree Mark Brown
2019-03-27  5:56 ` [PATCH V1 03/26] spi: tegra114: fix for unpacked mode transfers Sowjanya Komatineni
2019-04-01  8:54   ` Applied "spi: tegra114: fix for unpacked mode transfers" to the spi tree Mark Brown
2019-03-27  5:56 ` [PATCH V1 04/26] spi: tegra114: use packed mode for 32 bits per word Sowjanya Komatineni
2019-04-01  7:39   ` Mark Brown
2019-04-01 18:38     ` Sowjanya Komatineni
2019-04-01  8:54   ` Applied "spi: tegra114: use packed mode for 32 bits per word" to the spi tree Mark Brown
2019-03-27  5:56 ` [PATCH V1 05/26] spi: tegra114: use unpacked mode for below 4 byte transfers Sowjanya Komatineni
2019-04-01  8:26   ` Mark Brown
2019-03-27  5:56 ` [PATCH V1 06/26] spi: tegra114: terminate dma and reset on transfer timeout Sowjanya Komatineni
2019-04-01  8:54   ` Applied "spi: tegra114: terminate dma and reset on transfer timeout" to the spi tree Mark Brown
2019-03-27  5:56 ` [PATCH V1 07/26] spi: tegra114: flush fifos Sowjanya Komatineni
2019-04-01  8:54   ` Applied "spi: tegra114: flush fifos" to the spi tree Mark Brown
2019-03-27  5:56 ` [PATCH V1 08/26] spi: tegra114: configure dma burst size to fifo trig level Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 09/26] spi: tegra114: dump SPI registers during timeout Sowjanya Komatineni
2019-04-01  7:39   ` Mark Brown
2019-03-27  5:56 ` [PATCH V1 10/26] spi: tegra114: avoid reset call in atomic context Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 11/26] spi: tegra114: reset controller on probe Sowjanya Komatineni
2019-04-01  8:54   ` Applied "spi: tegra114: reset controller on probe" to the spi tree Mark Brown
2019-03-27  5:56 ` Sowjanya Komatineni [this message]
2019-04-01  8:54   ` Applied "spi: tegra114: add SPI_LSB_FIRST support" " Mark Brown
2019-03-27  5:56 ` [PATCH V1 13/26] spi: tegra114: add dual mode support Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 14/26] spi: tegra114: add 3 wire transfer " Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 15/26] spi: tegra114: set supported bits_per_word Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 16/26] spi: tegra114: set bus number based on id Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 17/26] spi: tegra114: add support for interrupt mask Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 18/26] spi: tegra114: add support for hw based cs Sowjanya Komatineni
2019-04-01  7:48   ` Mark Brown
2019-04-01 18:40     ` Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 19/26] DT bindings: spi: add spi client device properties Sowjanya Komatineni
2019-04-01  7:37   ` Mark Brown
2019-04-01 17:59     ` Sowjanya Komatineni
2019-04-02  4:52       ` Mark Brown
2019-03-27  5:56 ` [PATCH V1 20/26] spi: tegra114: add support for tuning HW CS timing Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 21/26] DT bindings: spi: add tx/rx clock delay SPI client properties Sowjanya Komatineni
2019-03-31  6:42   ` Rob Herring
2019-04-02 20:27     ` Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 22/26] spi: tegra114: add support for tuning clock delay Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 23/26] spi: tegra114: add support for gpio based cs Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 24/26] spi: tegra114: de-assert CS before SPI mode is reset to its default Sowjanya Komatineni
2019-04-01  7:49   ` Mark Brown
2019-04-01 18:07     ` Sowjanya Komatineni
2019-04-02  4:52       ` Mark Brown
2019-03-27  5:56 ` [PATCH V1 25/26] spi: expand mode and mode_bits support Sowjanya Komatineni
2019-03-27  5:56 ` [PATCH V1 26/26] spi: tegra114: add support for LSBYTE_FIRST Sowjanya Komatineni

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